Higher and lower salinity waters are still recognisable a long way from their source due to slow ocean mixing. Question Date: 2017-03-02: Answer 1: Salt is sodium chloride NaCl. The method of production is determined by the location from which the salt is harvested. It comes from the land where rivers for eons have carried it to the sea, where the salt stays when the water evaporates (over and over), causing the salt to become more and more concentrated. Salt is defined as  two things really in terms of context. Eventually this water emerges and it flows to the ocean as rivers, carrying with it a cocktail of chemical constituents that enter the oceans over many millions of years. Salt was a very rare commodity until the industrial revolution provided the technology to discover vast salt reserves. Rock salt does not always form from ancient lakes. Sign up to our newsletter and we'll send fresh new courses and special offers direct to your inbox, once a week. All Rights Reserved. Festival of Sacrifice: The Past and Present of the Islamic Holiday of Eid al-Adha, Difference between Kosher Salt and Table Salt. And these salts are slightly different to ocean waters too. Have a look at the video! Where does the salt scattered by gritters come from? What happens next? Solution Mining is where wells, similar to oil and gas wells, are set up over salt deposits and fresh water is injected to dissolve the salt. The majority of “rock salt” (used to de-ice highways and walkways) is produced this way. We do know that rivers contain only a tiny amount of salt, just a pinch compared to ocean waters. What differentiates salts are their source and the method of harvest. For more, check out my comrade Emma Chistensen’s photos at The Kitchn. Salt that is used for a variety of industrial and food-related purposes comes primarily from shallow bodies of sea or mineral water and from mining operations dedicated to salt production. Salt was once used as a currency as valuable as gold – traded and fought over around the world. Salt also may be found in domes, which were formed when Earth pressures forced salt up through cracks in the bedrock from depths as great as 30,000 or 40,000 feet; they resemble plugs of almost-circular shape a few hundred yards to a mile across. You’ll also need some excellent excellent sea salt. And at prices we can afford? Whether salt is mined from ancient sea beds under the city of Detroit, the Appalachian Mountains or the Himalayan Mountains; extracted from salt domes along the Louisiana coastline, or solar evaporated from the Atlantic or Pacific oceans – all salt comes from the sea! In warm regions with low rates of precipitation, salt is harvested once a year from shallow ponds and pools evaporated by the sun during the summer. The salt is then harvested either by hand or by machine. Where does salt come from? Because this salty water is effectively “erupted” at high temperatures, it forms a variety of unusual, and often very short-lived geological features, such as the “hornitoes” seen in some of these photos. It’s salt. And these proportions may vary slightly depending on the rocks that have been dissolved and where these rivers have come from. It is a jack of all trades that can enhance the flavor of foods in your kitchen and assist in the manufacture of paper, plastics, and fertilizers. This primarily results in rock salt. That’s why we end up with a totally different balance of salts in rivers and the ocean. Something else must be going on to account for the difference between the river water and the sea water’s composition. There are three basic technologies to produce salt: Deep-Shaft Mining is much like mining for any other mineral. Now, the composition of rocks that dissolve on land are not all the same. Geologists call it Halite, chemists call it sodium chloride (NaCl)— the rest of us call it salt. So, the analogy is, sprinkle salt into a few table spoons of water; not too much. Eventually what’s left is simply salt—more of an ice rink than a pond, rock hard and bright as snow. Other sources of salt are pushed up through the earth by volcanic forces, creating fascinating geological formations limited to unique areas. When they reach the surface they cool, and the salt in the waters returns to its crystalline form. From there it goes to the wash house, is screened and packaged, and becomes rock salt, table salt, kosher salt, and other salty products.

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